code: def test(self, test_data, res_data):
      result = fftn_centered(
          test_data, spatial_dims=2, is_complex=False
      )
      assert_allclose(result, res_data, type_test=True)
  
file_path: MONAI/tests/test_fft_utils.py
imports: from __future__ import annotations
  import unittest
  from parameterized import parameterized
  from monai.data.fft_utils import fftn_centered, ifftn_centered
  from tests.utils import TEST_NDARRAYS, assert_allclose
label_desc: Use image node_id 1 for calling the TestFFT obj's underlying member method code with example usage: obj.test(test_data, res_data) without return types